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Avalanche Forecast

Archived

Apr 18th, 2022–Apr 19th, 2022

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead.

Assess whether new slabs have formed before committing to steep and consequential terrain.

Confidence

Moderate - Forecast snowfall amounts are uncertain. Uncertainty is due to the limited number of field observations.

Weather Forecast

MONDAY NIGHT: Cloudy with snowfall, accumulation 5 to 10 cm, 20 km/h south wind, alpine temperature -3 C, freezing level 1800 m.

TUESDAY: Cloudy with snowfall, accumulation 5 to 10 cm, 30 to 40 km/h southwest wind, alpine temperature -7 C, freezing level 1500 m.

WEDNESDAY: Mostly clear skies with no precipitation, 10 km/h southwest wind, alpine temperature -3 C, freezing level 1800 m.

THURSDAY: Mostly cloudy with snowfall, accumulation 2 to 5 cm, 10 km/h southwest wind, alpine temperature -3 C, freezing level 1800 m.

Avalanche Summary

We did not receive any reports of avalanche observations in the past few days.

Please consider posting your observations to the Mountain Information Network to supplement our data stream and help fellow recreationists.

Snowpack Summary

Around 10 to 20 cm of snow is forecast to accumulate by Tuesday across the region. The snow will fall with southwest wind, which may form new wind slabs in lee terrain features at higher elevations. The snow will fall onto 10 to 20 cm of consolidated snow over a hard melt-freeze crust at higher elevations. Below the rain-snow line, rain will wet a consolidated snowpack.

The remainder of the snowpack is strong, consisting of hard snow and various melt-freeze crusts.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs are most reactive during their formation.
  • Watch for fresh storm slabs building throughout the day.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.